Using Eclipse as a Web development platform is even easier when you integrate it directly with Apache Tomcat. Learn how to set up Eclipse and Apache Tomcat V5.5 to develop the quintessential Hello World servlet.
Help -> Install New Software
Choose "Helios - http://download.eclipse.org/releases/helios" site
Expand "Web, XML, and Java EE Development"
Check JST Server Adapters (version 3.2.2)